[Mono-list] XmlSerializer with Dictionary

[Dan Maltes]

In the MS .NET framework isn't this by design?  Can't serialize a
Dictionary?  I think some have used IXMLSerializable as a workaround.

-Dan Maltes

-----Original Message-----
From: mono-list-bounces at lists.ximian.com
[mailto:mono-list-bounces at lists.ximian.com] On Behalf Of Gert Driesen
Sent: Thursday, January 19, 2006 2:53 PM
To: 'Colin JN Breame'; mono-list at lists.ximian.com
Subject: RE: [Mono-list] XmlSerializer with Dictionary

Hi Colin,

I'm looking into fixing quite some (compatibility) issues in
XmlSerializer (and XmlSchemaExporter, XmlReflectionImporter,
SoapReflectionImporter, ...).

Please submit a bug report for this and feel free to assign it to me.

Gert

> -----Original Message-----
> From: mono-list-bounces at lists.ximian.com
> [mailto:mono-list-bounces at lists.ximian.com] On Behalf Of Colin JN 
> Breame
> Sent: woensdag 18 januari 2006 22:32
> To: mono-list at lists.ximian.com
> Subject: [Mono-list] XmlSerializer with Dictionary
> 
> Hello,
> 
> When I try to xml serialise a generic dictionary (e.g. 
> Dictionary<string,string>), I get the exception:
> 
> System.InvalidOperationException: You must implement a default 
> accessor on System.Collections.Generic.Dictionary`2[snip] because it 
> inherits from ICollection
> 
> This looks like it could be a bug but then again I'm not even sure it 
> is possible to serialise a generic dictionary.  Any pointers would be 
> appreciated.
> 
> Cheers,
> Colin
> 
> 
> test program:
> 
> using System.Collections.Generic;
> using System.IO;
> using System.Xml.Serialization;
> 
> public class main_t {
>   public static void Main() {
>     Dictionary<string, string> test = new Dictionary<string,
> string>();
>     StreamWriter writer = new StreamWriter("output");
> 
>     XmlSerializer serialiser = new
> XmlSerializer(typeof(Dictionary<string,
>                                                         string>));
>     serialiser.Serialize(writer, test);
>   }
> }
> 
> 
> exception:
> 
> Unhandled Exception: System.InvalidOperationException: You must 
> implement a default accessor on 
> System.Collections.Generic.Dictionary`2[[System.String,
> mscorlib, Version=2.0.0.0, Culture=neutral, 
> PublicKeyToken=b77a5c561934e089], [System.String, mscorlib, 
> Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] 
> because it inherits from ICollection in <0x001f7> 
> System.Xml.Serialization.TypeData:get_ListItemType () in <0x0001f> 
> System.Xml.Serialization.TypeData:get_ListItemTypeData () in <0x00145>

> System.Xml.Serialization.TypeData:.ctor
> (System.Type type,
> System.String elementName, Boolean isPrimitive, 
> System.Xml.Serialization.TypeData mappedType, 
> System.Xml.Schema.XmlSchemaPatternFacet facet) in <0x00019> 
> System.Xml.Serialization.TypeData:.ctor
> (System.Type type,
> System.String elementName, Boolean isPrimitive) in <0x0032b> 
> System.Xml.Serialization.TypeTranslator:GetTypeData (System.Type type,

> System.String xmlDataType) in <0x0000c> 
> System.Xml.Serialization.TypeTranslator:GetTypeData (System.Type
> type)
> in <0x0005a>
> System.Xml.Serialization.XmlReflectionImporter:ImportTypeMapping
> (System.Type type, System.Xml.Serialization.XmlRootAttribute root, 
> System.String defaultNamespace) in <0x0009d> 
> System.Xml.Serialization.XmlSerializer:.ctor
> (System.Type type,
> System.Xml.Serialization.XmlAttributeOverrides overrides, 
> System.Type[] extraTypes, System.Xml.Serialization.XmlRootAttribute 
> root, System.String
> defaultNamespace)
> in <0x00015> System.Xml.Serialization.XmlSerializer:.ctor
> (System.Type type)
> 
> 
> 
> 
> 
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